Was just reading an article on rabbits.
Based on a 9-10 month breeding season from Jan-Feb to Sept-October
30 day gestation
Litter size from 4 to 10 babies,
the fact that does can breed from 6 months old
they can breed as often as every 6 weeks (6 times a year!)
The article suggested that one female rabbit could have as many as 600-800 rabbits, grand-rabbits, great grand-rabbits in a single year!!!
and they can live for 9-12 years!!
rabbits born in March will breed in August, those born in April will breed in September etc etc!